I had Both DT-880-600 ohms and DT-880 Pro , on my setup , and could compare them for a little with K702 .
In bass impact DT-880 Pro is clearly ahead , and sub bass too , there is much more HUMPH on DT-880 PRO , on this point my DT-880-600 ohms was just a bit more impactfull than my K702 ...
My english is not great and i said before that in bass department DT-880-600 and K702 is about the same , but it's not exact for bass Impact yes it is , but for quantity , DT-880-600 ohms has more bass , (some instruments are more bodied and sounds fuller , and DT-880-600 ohms is more grounded than K702 etc) .
DT-880 Pro head band clamps your hard harder wich make a direct impact on bass , if you compress your DT-880-600 on your hears you will ear a boost on bass impact .
But DT-880 Pro
1) Use a 250 ohms drivers
2) Trebble is even more pronouced than 600 ohms wich i found trebble more pronouced than my K702 like said before (but for me not a problem at all :
, in i am on the bright side
) , Mids are a bit recessed , a bit much for my licking , with DT-880-600 ohms they are ok for me in comparison to K702 where i found them having a touch of warm .
Soudstage is not as wide but still decent , but less airy , more congestionned , overall you loose a bit clarity with DT-880 PRO .
Again for bass there is more punch on DT-880 PRO , but they lack clarity ... and are less refined and detailled than DT-800-600 ohms , and for me peraphs a bit too much ...
On my System DT-880-600 ohms , bass are very dry like on K702 , but very detailled ones with super clarity , and in more quantity than K702 . (not on bass impact like said )
DT-880-600 ohms is more neutral for me than DT-880 Pro and they don't lack in bass departement , but peraphs a bit on bass impact for some people (i can understand that) .
On my system DT-880-600 ohms is colder than K702 wich have like i said a touch of warm on mids (soo peraphs less neutral than DT-880-600 ohms , DT-880 pro wich recessed mids and boosted bass impact is alsoo less neutral on my mind) .
That's all , on an OTL TUBE amp peraphs DT-880-600 ohms would have the same detailled and clear bass , but with more impact , i don't know ^^ , i was very happing using my gone DT-880-600 ohms on my C2.1 , but DT-880-600 ohms will be back soon , Manufaktur one this time